Leak Detection Sensor: Testing and Inspection

1. INSPECT POWER SOURCE VOLTAGE OF VAPOR PRESSURE SENSOR
- Disconnect the vapor pressure sensor connector.
- Turn the ignition switch ON.
- Using a voltmeter, measure the voltage between connector terminals VC and E2 of the wiring harness side.

Voltage: 4.5 - 5.5 V.

- Turn the ignition switch to LOCK.
- Reconnect the vapor pressure sensor connection
2. INSPECT POWER OUTPUT OF VAPOR PRESSURE SENSOR
- Turn the ignition switch ON.
- Disconnect the vacuum hose from the vapor pressure sensor.





- Connect a voltmeter to terminals PTNK and E2 of the ECM, and measure the output voltage under the following conditions:
- Apply vacuum (2.0 kPa, 15 mmHg, 0.59 in.Hg) to the vapor pressure sensor.

Voltage: 1.3 - 2.1 V

- Release the vacuum from the vapor pressure sensor.

Voltage: 3.0 - 3.6 V

- Apply pressure (1.5 kPa, 15 gf/sq.cm, 0.22 psi to the vapor pressure sensor.

Voltage: 4.2 - 4.8 V

- Reconnect the vacuum hose to the vapor pressure sensor.